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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘C++’ Category

Valetudo | Cloud-free control webinterface for Xiaomi vacuum robots

Posted by jpluimers on 2022/01/04

[Wayback] Valetudo | Cloud-free control webinterface for vacuum robots

Valetudo is a standalone binary which runs on rooted Vacuums of the Xiaomi ecosystem and aims to enable the user to operate the robot vacuum without any Cloud Connection whatsoever.

You can even use it to make a WiFi heat map of the floors in your home: the Valeroni app can do that for you.

The Valeroni app is open source too: [Wayback/] ccoors/Valeronoi: A WiFi mapping companion app for Valetudo

Via [] Kristian Köhntopp on Twitter: “Paging @sys_adm_ama: … Alternative Firmware für Robot-Staubsauger … Alternative Firmware für Robot-Staubsauger verwenden, um das Wifi im Haus zu mappen (und Staub zu saugen)”


Read the rest of this entry »

Posted in C++, Development, Hardware, LifeHacker, Power User, Software Development, WiFi | Leave a Comment »

The Charlie Calvert “Here’s to Good Friends and New Adventures” article

Posted by jpluimers on 2021/10/14

Since this contains a list of contains from back then (20+ years ago!), I save it for future reference: [WayBack] Here’s to Good Friends and New Adventures

I would like to make a very short list of the other people at Borland who I have had the privilage of working with very closely. These people are Jason Sprenger, Xavier Pacheco, Steve Teixeira, John Kaster, Lar Mader and Rich Jones. Each of these people I worked with every day over a period of years, and they never showed me anything but the very best and most admirable human traits. I hope I am so lucky as to work with such fine people again in my life.

As for all the others, there is no way even to begin to thank them. A few of these people are Karen Giles, Lino Tadros, Steve Trefethen, Christine Ellis, Paolo Ciccone, Yolanda Davis, Blake Stone, Bruneau Babet, Dave Marancik, Anders Ohlsson, Dave Powell, Claudio Briceno, Joe Manzone, Terri Bartos, Dave Wilhelm, Andrea Ginsberg, Jason Vokes, Ludo Neveu, Martin Pamdeth, Martin Raim, Ernesto Franchini, Edwin Desouza, Zack Urlocker, Rosemary Abell, Robert Warren, Scott Bussinger, Richard Morris, Paul Beach, Jeremy McGee, Nimish Vora, Michael Swindell, Lorie Hull, Kendyll Upstrom, Kari Gallant, Allen Bauer, Josh Dahlby, Jose Rubens, John Thomas, John Williams, J.D. Hildebrand, Hizo Jozsef, Goran Kallmark, Ben Riga, George Cross, Gary Benner, Fred Felman, Erik Jakowitz, Danny Thorpe, Craig Farrell, Claudia Currie, Bill Weber, Lance Devon, Robert West, Amber Hein, Richard Kubat, Jeff Peters, Ellie Peters, Krystyna Niedzwiedzka, Kathy Berkland, Kelly Welty, Tom Lam, Nester Miranda (and Carlos!), Dana Kaufman, Pawal Ksiezyk, Jim Wright, Lori and Ellen from travel, Sergey Orlik and many others who I just don’t happen to recall right now, or who I liked very much but only met a few times.

I’m also indebted to Ray Kanopka, Mark Miller, Dick Malley, Dan Horn, Taco Oosterkamp, Bob Swart, Ann Lynnworth, Marco Cantu, Jeroen Pluimers, and many more who worked in the Borland community and brought me great joy. It’s amazing to consider how many talented and remarkable people have been drawn to this company.


Posted in Borland C++, C++, C++ Builder, Delphi, Development, Pascal, Software Development, Turbo Pascal | Leave a Comment »

SetProcessWorkingSetSize: you hardly – if ever – need to call this from your process

Posted by jpluimers on 2021/07/07

There are quite a few posts that recommend using SetProcessWorkingSetSize to trim your process working set, usually in the SetProcessWorkingSetSize(ProcessHandle, -1, -1) form:

[WayBack] SetProcessWorkingSetSize function (winbase.h) | Microsoft Docs

Sets the minimum and maximum working set sizes for the specified process.

BOOL SetProcessWorkingSetSize(
  HANDLE hProcess,
  SIZE_T dwMinimumWorkingSetSize,
  SIZE_T dwMaximumWorkingSetSize );

The working set of the specified process can be emptied by specifying the value (SIZE_T)–1 for both the minimum and maximum working set sizes. This removes as many pages as possible from the working set. The [WayBack] EmptyWorkingSet function can also be used for this purpose.

In practice you hardly ever have to do this, mainly because this will write – regardless of (dis)usage – all of your memory to the pagefile, even the memory your frequently use.

Windows has way better heuristics to do that automatically for you, skipping pages you frequently use.

It basically makes sense in a few use cases, for instance when you know that most (like 90% or more) of that memory is never going to be used again.

Another use case (with specific memory sizes) is when you know that your program is going to use a defined range of memory, which is outside what Windows will heuristically expect from it.

A few more links that go into more details on this:

  • [WayBack] windows – Pros and Cons of using SetProcessWorkingSetSize – Stack Overflow answers by:
    • Hans Passant:

      SetProcessWorkingSetSize() controls the amount of RAM that your process uses, it doesn’t otherwise have any affect on the virtual memory size of your process. Windows is already quite good at dynamically controlling this, swapping memory pages out on demand when another process needs RAM.

      By doing this manually, you slow down your program a lot, causing a lot of page faults when Windows is forced to swap the memory pages back in.

      SetProcessWorkingSetSize is typically used to increase the amount of RAM allocated for a process. Or to force a trim when the app knows that it is going to be idle for a long time. Also done automatically by old Windows versions when you minimize the main window of the app.

    • Zack Yezek:

      The only good use case I’ve seen for this call is when you KNOW your process is going to hog a lot of the system’s RAM and you want to reserve it for the duration. You use it to tell the OS “Yes, I’m going to eat a lot of the system RAM during my entire run and don’t get in my way”.

    • Maxim Masiutin:

      We have found out that, for a GUI application written in Delphi for Win32/Win64 or written in a similar way that uses large and heavy libraries on top of the Win32 API (GDI, etc), it is worth calling SetProcessWorkingSetSize once.

      We call it with -1, -1 parameters, within a fraction of second after the application has fully opened and showed the main window to the user. In this case, the SetProcessWorkingSetSize(... -1, -1) releases lots of startup code that seem to not needed any more.

  • [WayBack] c# – How to set MinWorkingSet and MaxWorkingSet in a 64-bit .NET process? – Stack Overflow answer by Hans Passant:

    Don’t pinvoke this, just use the Process.CurrentProcess.MinWorkingSet property directly.

    Very high odds that this won’t make any difference. Soft paging faults are entirely normal and resolved very quickly if the machine has enough RAM. Takes ~0.7 microseconds on my laptop. You can’t avoid them, it is the behavior of a demand_paged virtual memory operating system like Windows. Very cheap, as long as there is a free page readily available.

    But if it “blips” you program performance then you need to consider the likelihood that it isn’t readily available and triggered a hard page fault in another process. The paging fault does get expensive if the RAM page must be stolen from another process, its content has to be stored in the paging file and has to be reset back to zero first. That can add up quickly, hundreds of microseconds isn’t unusual.

    The basic law of “there is no free lunch”, you need to run less processes or buy more RAM. With the latter option the sane choice, 8 gigabytes sets you back about 75 bucks today. Complete steal.

  • [WayBack] c++ – SetProcessWorkingSetSize usage – Stack Overflow answer by MSalters:

    I had an application which by default would close down entirely but keep listening for certain events. However, most of my code at that point would not be needed for a long time. To reduce the impact my process made, I called SetProcessWorkingSetSize(-1,-1);. This meant Windows could take back the physical RAM and give it to other apps. I’d get my RAM back when events did arrive.

    That’s of course unrelated to your situation, and I don’t think you’d benefit.

  • [WayBack] delphi – When to call SetProcessWorkingSetSize? (Convincing the memory manager to release the memory) – Stack Overflow

    If your goal is for your application to use less memory you should look elsewhere. Look for leaks, look for heap fragmentations look for optimisations and if you think FastMM is keeping you from doing so you should try to find facts to support it. If your goal is to keep your workinset size small you could try to keep your memory access local. Maybe FastMM or another memory manager could help you with it, but it is a very different problem compared to using to much memory.

    you can check the FasttMM memory usage via FasttMM calls GetMemoryManagerState and GetMemoryManagerUsageSummary before and after calling API SetProcessWorkingSetSize.

    I don’t need to use SetProcessWorkingSetSize. FastMM will eventually release the RAM.

    To confirm that this behavior is generated by FastMM (as suggested by Barry Kelly) I crated a second program that allocated A LOT of RAM. As soon as Windows ran out of RAM, my program memory utilization returned to its original value.

  • [WayBack] delphi – SetProcessWorkingSetSize – What’s the catch? – Stack Overflow answer by Rob Kennedy:

    Yes, it’s a bad thing. You’re telling the OS that you know more about memory management than it does, which probably isn’t true. You’re telling to to page all your inactive memory to disk. It obeys. The moment you touch any of that memory again, the OS has to page it back into RAM. You’re forcing disk I/O that you don’t actually know you need.

    If the OS needs more free RAM, it can figure out which memory hasn’t been used lately and page it out. That might be from your program, or it might be from some other program. But if the OS doesn’t need more free RAM, then you’ve just forced a bunch of disk I/O that nobody asked for.

    If you have memory that you know you don’t need anymore, free it. Don’t just page it to disk. If you have memory that the OS thinks you don’t need, it will page it for you automatically as the need arises.

    Also, it’s usually unwise to call Application.ProcessMessages unless you know there are messages that your main thread needs to process that it wouldn’t otherwise process by itself. The application automatically processes messages when there’s nothing else to do, so if you have nothing to do, just let the application run itself.


Posted in .NET, C, C++, Delphi, Development, Software Development, Windows Development | Leave a Comment »

DCOM calls from thread pool threads: CoInitialize/CoUnitialize location and expensiveness?

Posted by jpluimers on 2021/06/24

Interesting takeaway from [WayBack] DCOM calls from thread pool threads

call CoInitialize* at the start, and call CoUninitialize before returning. Expensive, but necessary



Posted in .NET, C, C++, COM/DCOM/COM+, Delphi, Development, Software Development, Windows Development | Leave a Comment »

“No mapping for the Unicode character exists in the target multi-byte code page”

Posted by jpluimers on 2021/06/24

Usually when I see this error [Wayback] “No mapping for the Unicode character exists in the target multi-byte code page” – Google Search, it is in legacy code that uses string buffers where decoding or decompressing data into.

This is almost always wrong no matter what kind of data you use, as it will depend in your string encoding.

I have seen it happen especially in these cases:

  • base64 decoding from string to string (solution: decode from a string stream into a binary stream, then post-process from there)
  • zip or zlib decompress from binary stream to string stream, then reading the string stream (solution: decompress from binary stream to binary stream, then post-process from there)

Most cases I encountered were in Delphi and C code, but surprisingly I also bumped into C# exhibiting this behaviour.

I’m not alone, just see these examples from the above Google search:


Posted in .NET, base64, C, C#, C++, Delphi, Development, Encoding, Software Development, Unicode | Leave a Comment »

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